184 T. S. Hunt— Notes on Granitic Hocks. 



stone, like that of Lewiston, occurs with the mica-scliists on the 

 Maine Central Eailroad, near Danville Junction, and beds of a 

 purer crystalline hmestone were formerly quarried in the south- 

 east part of Brunswick, where they are interstratified with thin- 

 bedded dark hornblendic and micaceous gneiss, dipping S.E. at 

 a high angle. 



§ 19. At Danville Junction strata of hornblendic and mica- 

 ceous gneiss, passing into mica-schists, dip N.E. at moderate 

 angles, and include huge veins of endogenous granite. Two of 

 these appear in the hill just south of the railroad station, appar- 

 ently ininning with the strike of the beds. They are seen to 

 rest upon the mica-schist, and in one of them a 'mass of this 

 rock, three feet in width, is enclosed like a tongue in the gran- 

 ite, which has a transverse breadth of about seventy-five feet. 

 Notwithstanding the apparent intercalation of these granitic 

 masses the proof of their foreign origin is evident in a trans- 

 verse fracture and slight vertical dislocation of the mica-schists 

 around the broken edges of which the gi-anite is seen to wrap. 

 The endogenous character of this granite is well shown br its 

 banded structure; belts of white quartz some inches wide alter- 

 nate with others of coarsely cleavable orthoclase, while other 

 portions hold black tourmalines and garnets of considerable size. 



The evidence of disturbance of the strata in connection 

 with these endogenous granites is seen on a large scale at the 

 falls of the Sunday Eiver in Ketchum. These mica-schists and 

 gneisses, similar to those already noticed, enclose great masses oi 

 endogenous granite, which are seen to be transverse to t le 

 strata. On one side of such a mass more than sixty feet wide. 

 the schistose strata are twisted from their regular N."E. strike to 

 the N.W., and so enclosed in the granite as to appear as if mter-, 

 stratified with it for short distances. The banded structure oi 

 the transverse granite veins is here very marked. Some por- 

 tions present cleavage-planes of orthoclase six inches in diame- 

 ter; other parts, which are less coarse, abound in mica, bim^ 

 lar banded granite veins abound in the adjoining towns o 

 Newry and North Bethel, and sometimes present layers o 

 quartz six inches or more in thickness, besides large crystals o 

 mica, and more rarely apatite. These veins are often irreguJ-^ 

 in shape and bulging at intervals, and they sometimes run p^ 

 tially across the beds, which seem to have been distended a'^ 

 disturbed, a fact which was also observed in the tbin-bedd^l 

 schists m contact with some of the veins in Brunswick, and ^ 

 notrceTi/8 2r *° ^^^ ^^Pansive force of crystallization, ^ 

 iJf^^\^^^ ^"""^^^'^y ^^'^^^^7 described at Danville offers ^n 

 instructive example of a phenomenon often met with in ^ 

 region now under consideration, where granitic masses, resist 



